net: phy: broadcom: re-add mistakenly removed config settings

Previous patch mistakenly removed three chip-specific config settings.
Add them again.

Fixes: 80274aba

 "net: phy: remove generic settings for callbacks config_aneg and read_status from drivers"
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>